add a placeholder to list all members of an island

[Shottzyy]

There are placeholders for pretty much everything else but I could not find a placeholder to list all members of an island, for example %superior_island_members_list_1% would show all members of island top 1, this would be insanely helpful for creating your own custom menus, or use within discord bots (which is what I would like to use it for)

Why I want this added;

I would like to display the current members of an island, with their island worth and output it every few hours so I can easily monitor any rule breakers from boosting themselves very high, but this will also be very useful for menus and I think this should be added because it is likely already apart of the api so it should be easy to implement.